<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<div id="app">
			<h2>当前计数:{{counter}}</h2>
			
			<!-- <button type="button" v-on:click="counter++">
				+
			</button>
			<button type="button" v-on:click="counter--">
				-
			</button> -->
			<button type="button" v-on:click="add">+</button>
			<button type="button" v-on:click="sub">-</button>
		</div>
		<script src="../js/vue.js"></script>
		<script>
			const app=new Vue({
				el:"#app",
				data:{
					counter:0
				},
				methods:{
					add:function(){
						console.log("add被执行");
						this.counter++;
					},
					sub:function(){
						console.log("sub被执行");
						this.counter--;
					}
				}
			})
		</script>
	</body>
</html>
